SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. FRONT CABINET 4 front cabinet 3 two claws 3 two claws 1 lid, battery case 2 two screws (P2 × 8) MAIN BOARD, KEY BOARD 2 KEY board 2 MAIN board 1 two claws –...
SECTION 3 ELECTRICAL ADJUSTMENTS AM IF ADJUSTMENT 0 dB=1 µV Adjust for a maximum reading on level meter [AM] 450 kHz Setting: BAND switch: AM AM FREQUENCY COVERAGE ADJUSTMENT Put the lead-wire Adjustment Part Frequency Display Reading on Digital Voltmeter AM RF signal antenna close to generator...
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Adjustment Location: – MAIN BOARD (Component Side) – – MAIN BOARD (Conductor Side) – FM Stereo (76 kHz) Adjustment AM Frequency Coverage Adjustment FM Tracking Adjustment AM IF Adjustment AM Tracking Adjustment TP (76 kHz) TP (ANT) TP (VT) – 6 –...
SRF-PSY04 SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAM VREF 10.7MHz HEADPHONE AMP FM/AM FRONT-END, FM/AM DET, MPX L-CH REGULATOR FM SENS POWER OUT2 FM/AM FM RF –1 MIX OUT 10.7MHz IF IN DECODER FM IF AMP/ B.P.F. FRONT-END DISCRI R-CH POWER OUT1 –2...
SRF-PSY04 4-3. SCHEMATIC DIAGRAM • See page 13 for Waveforms. • See page 14 for IC Block Diagrams. Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF no mark : FM 50 WV or less are not indicated except for electrolytics ) : AM 〈〈...
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• Waveforms • IC Block Diagrams – KEY Board – – MAIN Board – IC1 CXA1238M-T6 1 IC101 !™ XOUT 500 mV/DIV, 10 µs/DIV 1.2 Vp-p FM FRONT-END AM FRONT-END REGULATOR 13.3 µ s 2 IC101 !£ XIN FM IF/ DISCRI REGULATOR 500 mV/DIV, 10 µs/DIV...
4-4. IC PIN FUNCTION DESCRIPTION • KEY BOARD IC101 µPD17015GS-520-GJG (SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL) Pin No. Pin Name Description Key return signal input for the key matrix 2 to 5 PC0 to PC3 Key scan signal output for the key matrix BEEP Beep sound drive signal output terminal BAND...
SECTION 5 EXPLODED VIEW NOTE: • -XX and -X mean standardized parts, so they • Items marked “*” are not stocked since they may have some difference from the original are seldom required for routine service. Some one. delay should be anticipated when ordering •...
SECTION 6 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they are seldom required for routine service. parts list may be different from the parts speci- fied in the diagrams or the components used Some delay should be anticipated when order- on the set.
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